Chop the hazelnuts finely. Mix butter, chopped and ground nuts, flour and 60 g sugar with your hands to form crumbles. Put the crumbles in a cool place.
Select the berries and wash them if necessary. Clean and quarter the strawberries. Strip currants from the panicles. Caramelise 75 g sugar in a pan. Add the fruit and warm it up for about 1 minute.
Put the fruit in an ovenproof dish and let it cool down for about 30 minutes.
Spread the crumbles on the berries and bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for 15-20 minutes until golden brown. Dust with icing sugar and serve.